Heater for mixers for concrete and the like



Sept, 6, 1932. P. F. STARY HEATER FOR MIXERS FOR CONCRETE AND THE LIKE J? J 5 \Mwi/Z LJQWL Filed. March 6, 1930 Patented Sept. 6, 1932.

UNITED. STATES PERCY F. STABY, FDETROIT,LAKES,VMINNESO'1A.

HEATER.FOR.MIXERS FOR Application filed March 6,

My invention relates to a commercial mixer for concrete and the like and has for its object the provision of a heater therefor, and to this end, it consists of the novel devices and combinations of devices, hereinafter described and defined in the claims.

The invention in its preferred form is essentially a stove surrounding the drum of a mixer to prevent excessive radiation and cooling of materials when mixing hot batches mainly, bituminus mixes, or to warm the mixer drum and aid in the mixingof any materials in cold weather.

The heater is designed primarily to aid in the mixing of bituminus materials, oils or tar and gavel in cold weather and insure a uniform mix-by preventing the cooling of materials while in the mixer with consequent lumping of materials and clogging, of the mixer. This heater also keeps the walls of the drum clean as the oil or tar will not stick to the warm walls. The embodiment of the invention in a mixer also materially aids in mixing cement concrete in freezing weather.

The invention may be applied to amixer as an attachment or it may bebuilt therein and in either case, remains in a constant relative position to the drum, tilts with the drum in tilting mixers, but is not rotatable therewith, and does not interfere with any operation of the mixer either in charging, mixing or discharging.

In the accompanying drawing, which illustrates the invention, like characters indicate like parts throughout the several views.

Referring to the drawing:

Fig. 1 is a fragmentary perspective view of a portable tilting mixer having the invention embodied therein;

Fig. 2 is a View principally in vertical section taken on the line 22 of Fig. 1;

Fig. 3 is a view partly in elevation and partly in section taken on the line 33 of Fig. 1, some parts being broken away; and

Fig. 4 is a fragmentary view partly in elevation and partly in section showing one of the burners and liquid fuel supply tank.

The commercial mixer, which is of the portable tiltable type, is only fragmentarily illustrated and of the parts thereof shown,

concnncrn AND, THE LIKE 1930. Serial 433,553.

it is important to note the truck frame'i5, supportingwheel 6, pedestals 7 supporting yoke8'joi1rnaldin said pedestals for swing-f ingmovementin a vertical plane, drum-9, drum ring 10, drum supporting rollers 11 and 5 cooperating thrustroller 12, and engine hous ing-13. F or the/"purpose offthis'case, it is not thought necessary to. illustrate theengi-ne or; driving connections therefrom forxrotats ing the drum and tiltingthe same except 0 the gear-14 on the ring 10 whichefo'rms apart of the-driving connectionsfor rotating said drum;

Referring now in detailto the invention", the numeral"15 indicates-a sheetisteel shell as or jacket that fits around the drum' 9, has substantially the same contour and is spaced therefrom to leave a'hot air chamber -16'there' between; The'heads of thedrum 9 loosely project through annular, openings in the heads of the shell 15; This shell-15 is rigidly secured tothe supporting yoke-"8 and held-- thereby in'a constant relative-position 'tothe drum 9' for common tilting movement therewith, does not rotate but permits fiee rota- 7 tion of th'edrum 9 therein. 7 r

7 Two commercial oilburners, each of which is indicated 'as antentirety by the numeral 17 ,are provided forsupplyi'ng heat-to the drum '9 and-thehotair chamber ;16. These do burners 17 are secured by brackets 18 tothe' 7 under side of the shell'15' one on each side of the supporting yoke 8' with the necessary airsupplya Gasoline orother liquid-fuel Z 'isconvey'ed tothe'burners 17 5 through a pipe 19'fhaving; a cut-off valve '20 and which 'pipe leads from a ,clo'sed' liquid fuel supplyta'nk 21 mounted on the shell 15. This-tank 21. has a normally closed filling neck 22]and a pump 23 by the use of which airmay be on introduced into the tank 21. to keep the fuel Z under the desired-pressure for proper feeding to the burners 17. The burners 17 keep the walls of the drum 9 constantly warm while rotating in the air chamber 16, and hence, the 25 contents in the drum.

The above described invention, while intended for use as heretofore stated, is especially well adapted for use on the type of mixer illustrated and used in the mixing of I00 patching materials for bituminous surfaced roadbeds.

What I claim is: V

1. In a mixer of the class described, the combination with a drum mounted for rotary and tilting movements, of a jacket for the drum spaced therefrom to leave a hot air chamber therebetween, said jacket being mounted for common tilting movement with the drum and in which the drum is free to rotate in the jacket,a liquid fuel burner w mounted to move with the jacket for heating the drum, and a fuel supply tank for the burner mounted on the jacket and having a supply conduit leading to said burner. 2. n

a mixer of the class described, the combination with an oscillatory supporting yoke and a drum rotatably mounted thereon, saidyoke being operable to move the drum into charging, mixing and discharging positions, of a jacket for the drum spaced therefrom to leave, a hot air chamber therebetween, said jacket being rigidly secured to the supporting yoke with the drum free to rotate therein, and a liquid fuel burner for the drum mounted to move with the jacket.

3. In a mixer of the class described, the combination with an oscillatory supporting yoke and a drum rotatably mounted thereon, said yoke being operable to move the drum into charging, mixing and discharging positions, of a jacket for the drum spaced therefrom to leave a hot air chamber therebetween, said jacket being rigidly secured to the supporting yoke with the drum free to rotate therein, .a liquid fuel burner for the drum,

and a fuel supply tank for the burner having a conduit leading to the burner, said burner and tank being relatively fixed in respect to v the acket.

4. In a mixer of the class described, the combination with an oscillatory supporting yoke and a drum rotatably mounted thereon, said yoke being operable to move the drum into charging, mixing and discharging positions, of a jacket for the drum spaced therefrom to leave a hot air chamber therebetween, said jacket being rigidly secured to the supporting yoke with the drum free to rotate therein, two liquid fuel burners'for heating the drum mounted on the bottom of the jacket, one on each side of the supporting yoke, and fuel supply tanks for the burners mount ed on the jacket and having a conduit leading to the burners.

In testimony whereof I aflix my signature.

PERCY F. STARY. 

